An auxiliary sealing structure for a self-tightening gasket

Abstract

This utility model belongs to the field of gasket technology, specifically disclosing an auxiliary sealing structure for a self-tightening gasket. The utility model includes a gasket body with at least one sealing groove on its outer wall. Each sealing groove has a first auxiliary sealing component on its inner wall. Second auxiliary sealing components are provided on both sides of the gasket body. Each first auxiliary sealing component includes a first sealing ring. Multiple second sealing rings with varying diameters in the second auxiliary sealing components can adapt to irregular deformations of the sealing surface, forming a multi-layered stepped seal. The central ring bears the main pressure, while the rings on both sides fill the edge gaps, blocking the medium penetration path in all directions. Even if the gasket body ages or undergoes minor deformation due to long-term use, this component can still maintain effective sealing on both sides of the gasket, significantly improving sealing reliability under complex operating conditions such as high temperature and high pressure, reducing leakage risk, and extending the overall service life of the gasket.

Description

Technical Field

[0001] This application relates to the field of gasket technology, and more specifically, to an auxiliary sealing structure for a self-tightening gasket. Background Technology

[0002] Self-tightening gaskets are sealing elements that achieve dynamic sealing enhancement by means of medium pressure or their own structural characteristics. Their core principle is that when the medium pressure in the system increases, the gasket will use the medium pressure to generate a self-tightening force, making the sealing surface fit more tightly, or further compensate for the sealing gap on the basis of the pre-tightening force through its own elastic structure (such as corrugated or wedge-shaped design), without relying on the continuous maintenance of bolt pre-tightening force.

[0003] Existing self-tightening gaskets fail to deliver a seal under low temperature and low pressure conditions because the medium pressure is insufficient to trigger the self-tightening mechanism and the pre-tightening compensation capacity of their elastic structure is limited. In addition, some metal self-tightening gaskets are prone to fatigue failure under frequent temperature fluctuations, and it is difficult to restore the sealing performance after the elasticity decays. Non-metallic gaskets are prone to aging and swelling when used in corrosive media for a long time, which shortens the service life and increases maintenance costs. Utility Model Content

[0004] To address the aforementioned issues, this application provides an auxiliary sealing structure for a self-tightening gasket.

[0005] The auxiliary sealing structure for a self-tightening gasket provided in this application adopts the following technical solution:

[0006] An auxiliary sealing structure for a self-tightening gasket includes a gasket body, at least one sealing groove is provided on the outer wall of the gasket body, a first auxiliary sealing component is provided on the inner wall of each sealing groove, and a second auxiliary sealing component is provided on both sides of the gasket body.

[0007] The first auxiliary sealing assembly includes a first sealing ring, which is used to reinforce the sealing groove;

[0008] The second auxiliary sealing assembly includes a second sealing ring, which is used to reinforce the seal on both sides of the gasket body.

[0009] Furthermore, each sealing groove has a first slot on both sides inside, and the number of the first slots corresponds to the number of the first sealing rings.

[0010] Furthermore, the structure of each first slot is adapted to the internal structure of the corresponding first sealing ring, and each first slot engages with the corresponding first sealing ring in an interference fit.

[0011] Furthermore, each of the first sealing rings has an inclined surface on one side.

[0012] Through the above technical solution, the inclined surface in the first auxiliary sealing assembly guides the first sealing ring to fit tightly against the inner wall of the groove under pressure. Combined with the elastic deformation of the first sealing ring itself, it can actively fill the tiny gaps between the groove and the slot, blocking the medium penetration path.

[0013] Furthermore, a second slot is provided on both sides of the gasket body, and a fixing ring is provided on both sides of the gasket body.

[0014] Furthermore, each second slot is inserted into the corresponding fixed ring body with an interference fit.

[0015] Furthermore, the number of second sealing rings is set to multiple, and the multiple second sealing rings are respectively fixed to one side of the corresponding fixed ring body.

[0016] Furthermore, the diameters of the multiple second sealing rings gradually decrease from the center outwards to both sides.

[0017] Through the above technical solution, the multiple second sealing rings with varying diameters in the second auxiliary sealing assembly can adapt to irregular deformation of the sealing surface, forming a multi-layer stepped seal.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] (1) This utility model can adapt to the irregular deformation of the sealing surface by using multiple second sealing rings with varying diameters in the second auxiliary sealing assembly to form a multi-layer stepped seal. The middle ring bears the main pressure, and the two side rings fill the edge gaps, blocking the medium penetration path in all directions. Even if the gasket body ages or undergoes slight deformation due to long-term use, the assembly can still maintain effective sealing on both sides of the gasket, significantly improving the sealing reliability under complex working conditions such as high temperature and high pressure, reducing the risk of leakage, and extending the overall service life of the gasket.

[0020] (2) The present invention guides the first sealing ring to fit tightly against the inner wall of the groove under pressure through the inclined surface in the first auxiliary sealing component. With the elastic deformation of the first sealing ring itself, it can actively fill the tiny gap between the groove and the slot, blocking the medium penetration path. At the same time, the component forms an independent reinforced sealing layer from the inside of the sealing groove. Even if the gasket body ages or undergoes slight deformation due to long-term use, the first sealing ring can still maintain an effective seal on the groove area, which can improve the sealing reliability and service life of the gasket body and reduce the risk of leakage. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0023] Figure 3 This is a plan view of the internal structure of the gasket body of this utility model;

[0024] Figure 4 This is a schematic diagram of the overall connection structure of this utility model;

[0025] Figure 5 For the present utility model Figure 2 Enlarged view of the structure at point A;

[0026] Figure 6 For the present utility model Figure 4 Enlarged view of the structure at point B.

[0027] Explanation of reference numerals in the attached drawings: 1. Gasket body; 2. Sealing groove; 3. First slot; 4. First sealing ring; 5. Inclined surface; 6. Second slot; 7. Fixing ring; 8. Second sealing ring. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] Reference Figures 1-6 An auxiliary sealing structure for a self-tightening gasket includes a gasket body 1, at least one sealing groove 2 is provided on the outer wall of the gasket body 1, a first auxiliary sealing component is provided on the inner wall of each sealing groove 2, and a second auxiliary sealing component is provided on both sides of the gasket body 1.

[0030] The first auxiliary sealing assembly includes a first sealing ring 4, which is used to reinforce the sealing groove 2;

[0031] The second auxiliary sealing assembly includes a second sealing ring 8, which is used to reinforce the seal on both sides of the gasket body 1.

[0032] Reference Figures 1-6 Each sealing groove 2 has a first slot 3 on both sides inside. The number of first slots 3 corresponds to the number of first sealing rings 4. The structure of each first slot 3 is adapted to the internal structure of the corresponding first sealing ring 4. Each first slot 3 is engaged with the corresponding first sealing ring 4 and is in an interference fit. Each first sealing ring 4 has an inclined surface 5 on one side.

[0033] The first auxiliary sealing component can enhance the sealing of the first sealing ring 4. Specifically, when the gasket body 1 is applied to a sealing scenario, under external pressure, the sealing groove 2 of the gasket body 1 tends to deform. Due to the interference fit between the first slot 3 and the first sealing ring 4, the first sealing ring 4 is firmly embedded in the slots on both sides of the sealing groove 2. When the pressure is transmitted to the sealing groove 2, the first sealing ring 4 is squeezed. Its inclined surface 5 on one side adapts to the pressure direction, guiding the first sealing ring 4 to fit more tightly against the inner wall of the groove. At the same time, the interference fit causes the first sealing ring 4 to deform elastically, filling the tiny gaps in the sealing groove 2. Compared with the basic self-tightening sealing gasket that relies solely on the deformation of the body structure for sealing, this auxiliary structure actively enhances the sealing from both sides inside the sealing groove 2 through the interference fit between the first sealing ring 4 and the first slot 3 and the adaptive deformation of the inclined surface 5. Combined with the reinforcement of the gasket sides by the second sealing ring 8, the overall sealing reliability is improved.

[0034] For example, in high-temperature and high-pressure pipeline flange sealing scenarios, basic self-tightening gaskets rely solely on the deformation of their own annular structure to achieve sealing. However, due to a sudden increase in temperature, the gasket body is prone to aging and thinning, resulting in uneven pressure on the sealing surface. In contrast, gaskets with auxiliary sealing structures, when the sealing groove 2 is squeezed by the flange, the first sealing ring 4, due to its interference fit with the first slot 3, tightly adheres to the inner wall of the groove through the inclined surface 5 under pressure, and elastically deforms to fill the gap, strengthening the seal from inside the groove. At the same time, the second sealing ring 8 strengthens the sealing on both sides of the gasket. Even if the basic body undergoes slight deformation due to high temperature, the double auxiliary seal can still prevent media leakage, making it more suitable for extreme working conditions than basic gaskets.

[0035] The interference fit in the first auxiliary sealing assembly ensures that the first sealing ring 4 is securely embedded in the sealing groove 2, preventing it from falling off under pressure fluctuations or vibration conditions and ensuring a stable sealing position. Furthermore, the inclined surface 5 guides the first sealing ring 4 to fit tightly against the inner wall of the groove under pressure. Combined with the elastic deformation of the first sealing ring 4 itself, it can actively fill the tiny gaps between the groove and the slot, blocking the medium penetration path. At the same time, this assembly forms an independent reinforced sealing layer from inside the sealing groove 2. Even if the gasket body 1 ages or undergoes slight deformation due to long-term use, the first sealing ring 4 can still maintain an effective seal on the groove area, which can improve the sealing reliability and service life of the gasket body 1 and reduce the risk of leakage.

[0036] Reference Figures 1-6 The gasket body 1 has a second slot 6 on both sides and a fixing ring 7 on both sides. Each second slot 6 is inserted into the corresponding fixing ring 7 and is in an interference fit. The number of second sealing rings 8 is set to be multiple. The multiple second sealing rings 8 are respectively fixed on one side of the corresponding fixing ring 7. The diameter of the multiple second sealing rings 8 gradually decreases from the middle to both sides.

[0037] The second auxiliary sealing assembly reinforces the seal on both sides of the gasket body 1. Specifically, when the gasket body 1 is in sealing condition, the fixing rings 7 on both sides are tightly fitted with the second grooves 6 due to interference fit, providing stable support for the second sealing rings 8. Under external pressure, the fixing rings 7 undergo slight deformation due to compression, causing multiple second sealing rings 8 with diameters gradually decreasing from the center to both sides to simultaneously conform to the sealing surface. Because the diameters of the second sealing rings 8 change in a gradient, they can adapt to the irregular deformation of the sealing surface caused by pressure and temperature fluctuations. The larger diameter second sealing ring 8 in the center can withstand the main pressure, while the smaller diameter second sealing rings 8 on both sides fill the edge gaps, forming a multi-layered stepped seal to ensure sealing continuity.

[0038] For example, in the sealing of high-temperature steam pipeline flanges, the sealing surfaces of the base gasket body 1 are prone to poor fit due to alternating temperature changes. However, the gasket with the second auxiliary sealing component has its fixing ring 7 firmly locked in the second groove 6. When the flange is heated and the gasket body 1 is squeezed, multiple second sealing rings 8 of varying diameters will fit the flange surface layer by layer. The larger diameter rings block the mainstream medium, and the smaller diameter rings seal the edge gaps. Even if the flange is slightly deformed due to thermal expansion and contraction, the stepped sealing structure can still maintain an effective seal, significantly reducing the risk of steam leakage.

[0039] The second sealing rings 8 with multiple diameter gradients in the second auxiliary sealing assembly can adapt to irregular deformation of the sealing surface, forming a multi-layer stepped seal. The central ring bears the main pressure, while the rings on both sides fill the edge gaps, blocking the medium penetration path in all directions. Even if the gasket body 1 ages or undergoes slight deformation due to long-term use, the assembly can still maintain an effective seal on both sides of the gasket, significantly improving the sealing reliability under complex working conditions such as high temperature and high pressure, reducing the risk of leakage, and extending the overall service life of the gasket.

[0040] Working principle: When the gasket body 1 is applied to a sealing scenario, under external pressure, the sealing groove 2 of the gasket body 1 tends to deform. Due to the interference fit between the first slot 3 and the first sealing ring 4, the first sealing ring 4 is firmly embedded in the slots on both sides of the sealing groove 2. When the pressure is transmitted to the sealing groove 2, the first sealing ring 4 is squeezed. Its inclined surface 5 on one side adapts to the pressure direction, guiding the first sealing ring 4 to fit more tightly against the inner wall of the groove. At the same time, the interference fit causes the first sealing ring 4 to deform elastically, filling the tiny gaps in the sealing groove 2. Compared with the basic self-tightening sealing gasket that relies solely on the deformation of the body structure for sealing, this auxiliary structure actively strengthens the seal from both sides inside the sealing groove 2 through the interference fit between the first sealing ring 4 and the first slot 3 and the adaptive deformation of the inclined surface 5. Combined with the reinforcement of the gasket sides by the second sealing ring 8, the overall sealing reliability is improved.

[0041] When the gasket body 1 is in sealing condition, the two retaining rings 7 are tightly fitted with the second grooves 6 due to interference fit, providing stable support for the second sealing rings 8. Under external pressure, the retaining rings 7 are compressed and undergo slight deformation, causing multiple second sealing rings 8 with diameters gradually decreasing from the center to the sides to simultaneously conform to the sealing surface. Because the diameters of the second sealing rings 8 change in a gradient, they can adapt to the irregular deformation of the sealing surface caused by pressure and temperature fluctuations. The larger diameter second sealing ring 8 in the center can withstand the main pressure, while the smaller diameter second sealing rings 8 on both sides fill the edge gaps, forming a multi-layered stepped seal to ensure sealing continuity.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An auxiliary sealing structure for a self-tightening gasket, comprising a gasket body (1), characterized in that, The outer wall of the gasket body (1) is provided with at least one sealing groove (2), and the inner wall of each sealing groove (2) is provided with a first auxiliary sealing component. The gasket body (1) is provided with a second auxiliary sealing component on both sides. The first auxiliary sealing assembly includes a first sealing ring (4), which is used to reinforce the sealing groove (2); The second auxiliary sealing assembly includes a second sealing ring (8), which is used to reinforce the sealing of both sides of the gasket body (1).

2. The auxiliary sealing structure of a self-tightening gasket according to claim 1, characterized in that: Each of the sealing grooves (2) has a first slot (3) on both sides inside, and the number of the first slots (3) corresponds to the number of the first sealing rings (4).

3. The auxiliary sealing structure of a self-tightening gasket according to claim 2, characterized in that: The structure of each first slot (3) is adapted to the internal structure of the corresponding first sealing ring (4), and each first slot (3) is engaged with the corresponding first sealing ring (4) in an interference fit.

4. The auxiliary sealing structure of a self-tightening gasket according to claim 1, characterized in that: Each of the first sealing rings (4) has an inclined surface (5) on one side.

5. The auxiliary sealing structure of a self-tightening gasket according to claim 1, characterized in that: The gasket body (1) has a second slot (6) on both sides and a fixing ring (7) on both sides.

6. The auxiliary sealing structure of a self-tightening gasket according to claim 5, characterized in that: Each of the second slots (6) is inserted into the corresponding fixing ring (7) and is in an interference fit.

7. The auxiliary sealing structure of a self-tightening gasket according to claim 1, characterized in that: The number of the second sealing rings (8) is set to multiple, and the multiple second sealing rings (8) are respectively fixed to one side of the corresponding fixed ring body (7).

8. The auxiliary sealing structure of a self-tightening gasket according to claim 1, characterized in that: The diameter of the plurality of second sealing rings (8) is gradually reduced from the middle to both sides.

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